124 citations · 802 across the 22 of their papers we have counts for
22 papers
VISIONS: The VISTA Star Formation Atlas -- I. Survey overview
Stefan Meingast, João Alves, Hervé Bouy +37
VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Aus…
Updated orbital monitoring and dynamical masses for nearby M-dwarf binaries
Per Calissendorff, Markus Janson, Laetitia Rodet +26
Young M-type binaries are particularly useful for precise isochronal dating by taking advantage of their extended pre-main sequence evolution. Orbital monitoring of these low-mass…
New low-mass members of Chamaeleon I and Cha
K. Kubiak, K. Mužić, I. Sousa +3
The goal of this paper is to increase the membership list of the Chamaeleon star forming region and the Cha moving group, in particular for low-mass stars and substellar object…
The GRAVITY young stellar object survey V. The orbit of the T Tauri binary star WW Cha
GRAVITY Collaboration, F. Eupen, L. Labadie +60
The young T Tauri star WW Cha was recently proposed to be a close binary object with strong infrared and submillimeter excess associated with circum-system emission. This makes WW…
Spectral characterization of newly detected young substellar binaries with SINFONI
Per Calissendorff, Markus Janson, Rubén Asensio-Torres +1
We observe 14 young low-mass substellar objects in young moving groups using the SINFONI IFS with LGS-AO to detect and characterize 3 candidate binary systems. Together with the ad…
Dynamical masses of M-dwarf binaries in young moving groups: II - Toward empirical mass-luminosity isochrones
Markus Janson, Stephen Durkan, Mickael Bonnefoy +6
Low-mass stars exhibit substantial pre-main sequence evolution during the first ~100 Myrs of their lives. Thus, young M-type stars are prime targets for isochronal dating, especial…
Multiple Star Systems in the Orion Nebula
GRAVITY collaboration, Martina Karl, Oliver Pfuhl +133
This work presents an interferometric study of the massive-binary fraction in the Orion Trapezium Cluster with the recently comissioned GRAVITY instrument. We observe a total of 16…
SPOTS: The Search for Planets Orbiting Two Stars. III. Complete Sample and Statistical Analysis
Ruben Asensio-Torres, Markus Janson, Mariangela Bonavita +8
Binary stars constitute a large percentage of the stellar population, yet relatively little is known about the planetary systems orbiting them. Most constraints on circumbinary pla…
Orion revisited III. The Orion Belt population
K. Kubiak, J. Alves, H. Bouy +11
This paper continues our study of the foreground population to the Orion molecular clouds. The goal is to characterize the foreground population north of NGC 1981 and to investigat…
New Circumstellar Structure in the T Tauri System
M. Kasper, K. K. R. Santhakumari, T. M. Herbst +1
The immediate vicinity of T Tauri was observed with the new high-contrast imaging instrument SPHERE at the VLT to resolve remaining mysteries of the system, such as the putative sm…
SPOTS: The Search for Planets Orbiting Two Stars: II. First constraints on the frequency of sub-stellar companions on wide circumbinary orbits
Mariangela Bonavita, Silvano Desidera, Christian Thalmann +4
A large number of direct imaging surveys for exoplanets have been performed in recent years, yielding the first directly imaged planets and providing constraints on the prevalence…
Orbits in the T Tauri triple system observed with SPHERE
R. Köhler, M. Kasper, T. M. Herbst +2
We present new astrometric measurements of the components in the T Tauri system, and derive new orbits and masses. T Tauri was observed during the science verification time of the…
SPOTS: The Search for Planets Orbiting Two Stars. I. Survey description and first observations
Christian Thalmann, Silvano Desidera, Mariangela Bonavita +13
Direct imaging surveys for exoplanets commonly exclude binary stars from their target lists, leaving a large part of the overall planet demography unexplored. To address this gap i…
Mid-infrared interferometry with K band fringe-tracking I. The VLTI MIDI+FSU experiment
A. Müller, J. -U. Pott, A. Mérand +11
Context: A turbulent atmosphere causes atmospheric piston variations leading to rapid changes in the optical path difference of an interferometer, which causes correlated flux loss…
Stellar companions to exoplanet host stars: Lucky Imaging of transiting planet hosts
Carolina Bergfors, Wolfgang Brandner, Sebastian Daemgen +7
Observed properties of stars and planets in binary/multiple star systems provide clues to planet formation and evolution. We extended our survey for visual stellar companions to th…
Orbits and Masses in the multiple system LHS 1070
R. Köhler, T. Ratzka, Ch. Leinert
We present a study of the orbits of the triple system LHS1070, with the aim to determine individual masses of its components. Sixteen new relative astrometric positions of the thre…
The Orbit of GG Tau A
Rainer Köhler
We present a study of the orbit of the pre-main-sequence binary system GG Tau A and its relation to its circumbinary disk, in order to find an explanation for the sharp inner edge…
VLT/NACO astrometry of the HR8799 planetary system. L'-band observations of the three outer planets
C. Bergfors, W. Brandner, M. Janson +2
HR8799 is so far the only directly imaged multiple exoplanet system. The orbital configuration would, if better known, provide valuable insight into the formation and dynamical evo…
Lucky Imaging survey for southern M dwarf binaries
C. Bergfors, W. Brandner, M. Janson +7
While M dwarfs are the most abundant stars in the Milky Way, there is still large uncertainty about their basic physical properties (mass, luminosity, radius, etc.) as well as thei…
Spatially resolved mid-infrared observations of the triple system T Tauri
Th. Ratzka, A. A. Schegerer, Ch. Leinert +6
To enhance our knowledge of the characteristics and distribution of the circumstellar dust associated with the individual components of the young hierarchical triple system T Tau,…
Orbits and Masses in the T Tauri System
Rainer Köhler, Thorsten Ratzka, T. M. Herbst +1
We investigate the binary star T Tauri South, presenting the orbital parameters of the two components and their individual masses. We combined astrometric positions from the litera…
Mass ratios of the components in T Tauri binary systems and implications for multiple star formation
Jens Woitas, Christoph Leinert, Rainer K"ohler
Using near-infrared speckle interferometry we have obtained resolved JHK-photometry for the components of 58 young binary systems. From these measurements, combined with other data…